Oracle Text

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

Cycling—Pay 2 life. (Pay 2 life, Discard this card: Draw a card.)

Card Rulings

10/1/2008 Cycling is an activated ability. Effects that interact with activated abilities (such as Stifle or Rings of Brighthearth) will interact with cycling. Effects that interact with spells (such as Remove Soul or Faerie Tauntings) will not.